Fix page zoom to be frame-centric for out-of-process frames.

content/common/page_messages.h

Index: content/common/page_messages.h
diff --git a/content/common/page_messages.h b/content/common/page_messages.h
index 284c134508b5d9227303ec5f96ec52235e628176..c434c80e14ce3c0c650db9c55a77293191c13b1f 100644
--- a/content/common/page_messages.h
+++ b/content/common/page_messages.h
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "content/common/page_message_enums.h"
 #include "ipc/ipc_message_macros.h"
+#include "ui/gfx/geometry/rect.h"
 
 // IPC messages for page-level actions.
 // Multiply-included message file, hence no include guard.
@@ -12,11 +14,19 @@
 
 #define IPC_MESSAGE_START PageMsgStart
 
+IPC_ENUM_TRAITS_MAX_VALUE(
+    PageMsg_SetZoomLevel_Command,
+    PageMsg_SetZoomLevel_Command::ZOOM_USE_CURRENT_TEMPORARY_MODE);

[alexmos, 2016/04/11 23:19:11]

It might be a good idea to define a PageMsg_SetZoomLevel_Command::LAST (=
USE_CURRENT_TEMPORARY_MODE in enum class) and use it here.  That way this won't
get out of date if a new command is added to the enum.  Many, though not all,
frame and view messages seem to use this pattern, so I'm guessing this is not
required but nice to have.

[wjmaclean, 2016/04/13 18:47:47]

Done.

+
 // Messages sent from the browser to the renderer.
 
 IPC_MESSAGE_ROUTED1(PageMsg_UpdateWindowScreenRect,
                     gfx::Rect /* window_screen_rect */)
 
+IPC_MESSAGE_ROUTED2(PageMsg_SetZoomLevel,
+                    PageMsg_SetZoomLevel_Command /* command */,
+                    double /* zoom_level */)
+
 // -----------------------------------------------------------------------------
 // Messages sent from the renderer to the browser.